strings.cx

//! reverse of 'Fernando' = 'odnanreF'\n'arara' is a palindrome: 1\n'Fernando' is a palindrome: 0\nvowel count in 'The Cx Programming Language' = 8\n
include <stdio.h>
include <string.h>

void reverseInto(char* src, char* dst) {
    int len = strlen(src);
    for (int i = 0; i < len; i++) {
        int x = len - 1 - i; // TODO
        dst[i] = src[x];
    }
    dst[len] = '\0';
}

bool isPalindrome(char* s) {
    int len = strlen(s);
    for (int i = 0; i < len / 2; i++) {
        int x = len - 1 - i; // TODO
        if s[i] != s[x] {
            return false;
        }
    }
    return true;
}

bool isVowel(char c) {
    return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'
        || c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U';
}

int countVowels(char* s) {
    int count = 0;
    int len = s.length;
    for (int i = 0; i < len; i++) {
        if isVowel(s[i]) {
            count = count + 1;
        }
    }
    return count;
}

int main() {
    char* name = "Fernando";
    char[16] reversed;
    reverseInto(name, reversed);
    printf("reverse of '%s' = '%s'\n", name, reversed);

    printf("'arara' is a palindrome: %d\n", isPalindrome("arara"));
    printf("'Fernando' is a palindrome: %d\n", isPalindrome("Fernando"));

    char* phrase = "The Cx Programming Language";
    printf("vowel count in '%s' = %d\n", phrase, countVowels(phrase));

    return 0;
}